JP2000275697A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve depiction performance when photographing a night view by making a film unit with a lens incorporate a long time exposure mechanism by which the irregularity in exposure inside a photographic picture frame is eliminated. SOLUTION: A slit 41a, having a size by which a shutter aperture 44, is totally opened is formed on a shutter disk 41. The disk 41 is kicked, so that exposure is performed while the slit 41a passes through the shutter aperture 44. When a gear 41e is formed on the disk 41, the disk 41 turns in an opening direction and the aperture 44 is opened completely, and the gear 41e is meshed with the gear 48a of a governor mechanism 47. Then, the control of the mechanism 47 is added to the disk 41, so that the disk 41 turns slowly. Then, the disk 41 turns in a closing direction by the pressing of a spring 43 for returning. The disk 41 is separated from the mechanism 47 before the aperture 44 is closed, returned to the closing position at a high speed, and one photographing is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a film unit with a lens, and more particularly, to a film unit with a lens dedicated to night view photography.

[0002]

2. Description of the Related Art At present, a film unit with a lens has been sold by the present applicant so that photographers can easily enjoy photography. The film unit with lens is a unit body that incorporates a photographic mechanism, such as a photographic lens and shutter device, and has a built-in unexposed photographic film in advance. Negatives and printed photographs can be easily obtained at developing shops, so they are widely used.

[0003] Various types of film units with a lens are commercially available, and there is also a built-in flash unit that incorporates a strobe device to enable photographing in a dark place such as at night or indoors. Such a film unit with a built-in strobe allows a proper strobe shooting to be performed on a main subject such as a person at a shooting distance of about 3 m when shooting in a dark place such as a room. Is set.

[0004]

However, the exposure time of a conventional film unit with a lens is about 1/60 to about 1/60.
At about 1/200 second, when photographing at night, even if the main subject such as a person is properly exposed, the background with a small amount of exposure is underexposed, which is unsatisfactory for the user.

As a method of solving this problem, it is conceivable to use a high-sensitivity film or open an aperture. However, when a high-sensitivity film is used, the cost of the film increases and the granularity increases. And storage stability deteriorate. In a camera having one or two photographing lenses, the aperture cannot be opened while maintaining the pan focus. Therefore, it is difficult to adopt the above two methods for a film unit with a lens, which is advantageous in that it can be provided at a low price.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when shooting outdoors at night, it is possible to shoot a night scene at a long distance and a night scene as a background of a main subject with proper exposure. It is an object of the present invention to provide a lens-fitted film unit.

[0007]

To achieve the above object, a film unit with a lens according to the present invention kicks a shutter plate provided with a slit for fully opening a shutter opening in response to a shutter release operation. After the shutter plate is fully opened, the movement of the shutter plate is braked to extend the exposure time until the shutter plate moves in the closing direction by the bias of the spring and the shutter opening starts to close. The exposure time is 1/30 second or more,
It is practically desirable to keep it shorter than 8 seconds.

Further, in a film unit with a lens provided with a shutter mechanism for making one rotation by rotating a disk-shaped shutter plate provided with a slit for fully opening a shutter opening, the slit is provided with the shutter opening. And the shutter plate is rotated by kicking in response to a shutter release. Also,
To prevent camera shake during long exposures,
It is preferable to provide a support jig on the unit body.

[0009]

FIG. 1 shows a film unit with a lens according to the present invention. The film unit 2 with a lens
It is composed of a unit main body 3 and an exterior label 4 that partially covers the unit main body 3. The unit main body 3 is loaded with a film together with a cartridge in advance, and has a shutter mechanism described later incorporated therein. Unit body 3
On the bottom of, as a support jig to prevent camera shake during shooting,
An extendable monopod 14 is assembled. Although not shown, the base of the monopod 14 is rotatable, and can be folded along the bottom surface of the unit body 3 when the monopod 14 is not used.

On the front surface of the unit body 3, there are provided a photographing lens 5, an object side window 7 of a finder 6, a strobe light emitting section 8 for emitting strobe light toward a subject, and a strobe charging start button 9. On the upper surface of the unit body 3, a shutter button 10, a counter window 11 for displaying the number of remaining photographable frames, and a strobe charging display window 12 are provided. A knob 13 for film winding operation is partially exposed on the back of the unit main body, and a finder eyepiece window is provided at a position facing the finder objective window 7 (not shown).

FIG. 2 shows an exploded view of the unit main body 3. The unit body 3 includes a body base 20, an exposure unit 2
1, a strobe device 22, a front cover 23, and a rear cover 24. At both ends of the main body 20, a cartridge chamber 20 a and a film roll chamber 20 b are integrally formed. Cartridge chamber 20a and film roll chamber 2
A cartridge 26 of the photo film cartridge 25 and a film roll 27a in which a photo film 27 drawn from the cartridge 26 is rolled are loaded in Ob at the manufacturing stage. An aperture 20c for determining the exposure screen size on the photographic film 27 is formed at the center of the main body base 20.

The exposure unit 21 has a dark box 28 for light-tightly blocking the optical path of the photographing lens 5 and assembling a photographing lens 5, a photographing mechanism such as a shutter device, an objective lens 6a and an eyepiece 6b constituting the finder 6, and the like. It is a unit. The exposure unit 21 is mounted on the front surface of the aperture 20c of the main body 20.

A film winding operation knob 13 is disposed above the cartridge chamber 20a, and a leading end of a winding shaft integrally provided on the lower surface thereof is engaged with a spool 26a of the cartridge 26. Thus, when the film winding operation knob 13 is rotated in the direction of the arrow in the drawing, the photographed portion of the photographic film 27 is wound into the cartridge 26a by the rotation of the spool 26a.

The strobe device 22 includes a trigger switch 3 in addition to the above-described strobe light emitting unit 8 and strobe switch 30.
1, a cylindrical main capacitor 32 for accumulating electric charge for strobe light emission, a battery (AA battery) 33 serving as a power supply, circuit elements for controlling charging and discharging, and the like are assembled on a printed circuit board 34 to form a unit. Things. The flash switch 30 is turned on / off in conjunction with the operation of the flash charging start button 9. Main capacitor 32
Is charged when the strobe switch 30 is turned on.

The trigger switch 31 is composed of two contact pieces arranged vertically and formed on the shutter disk when a shutter disk, which will be described later, is rotated and the shutter opening is fully opened. ON when two contact pieces come in contact with the pressing piece
become. When the trigger switch 31 is turned on while the strobe switch 30 is turned on, the electric charge charged in the main capacitor 32 is discharged in the strobe discharge tube. Thus, the strobe light is emitted from the strobe light emitting unit 8 toward the subject. Note that this strobe device 2
The guide number 2 is desirably about 3 to 7. By setting in this way, it is possible to prevent a main subject at a short distance from being overexposed, and to describe the background with a low-speed shutter mechanism described later.

The front cover 23 has a shutter button 10 integrally formed on the upper surface thereof. On the front surface of the front cover 23, an opening for exposing the photographing lens 5, the strobe light emitting unit 8, and the like are provided, and a strobe charging start button 9 is attached. The front cover 23 is provided on the main body 2 to which the exposure unit 21 and the strobe device 22 are assembled.
0 is attached to the front. The bottom cover 24a, 24b is formed at the bottom of the rear cover 24, and the bottoms of the cartridge chamber 20a and the film roll chamber 20b are light-tightly closed by these bottom covers 24a, 24b. By opening the bottom cover 24a of the cartridge chamber 20a, the cartridge 26 containing the photographed photo film 27 can be taken out.

FIG. 3 shows the exposure unit 21. This exposure unit 21 constitutes a low-speed shutter mechanism. A shutter disk 41 provided with a slit 41a is disposed between the front surface of the dark box 28 and the shutter cover 40 attached to the front surface. This shutter disk 41 is
It is rotatably attached to a shaft 42 protruding from the front surface of the dark box 28 and is urged counterclockwise by a spiral return spring 43. A shutter opening 44 is provided at the center of the front surface of the dark box 28, that is, on the photographing optical axis 5a of the photographing lens 5.

On the outer periphery of the shutter disk 41, a projection 4 is provided.
1b, a pressing piece 41d, and a projection 41c are integrally formed on the front surface of the shutter disk 41. The shutter disk 41 starts to rotate clockwise when the protrusion 41 b is kicked off by the kicking lever 45. When the charging of the strobe is completed when the slit 41a fully opens the shutter opening 44, the trigger switch 30 of the strobe device 22 is turned on by the pressing piece 41d. Further, the projection 41c comes into contact with the stopper 46, and the rotation of the shutter disk 41 in the clockwise direction is restricted.
A gear 41 is partially provided on the outer periphery of the shutter disk 41.
e is formed.

A governor mechanism 47 is provided diagonally below and to the left as viewed from the front of the shutter disk 41. The governor mechanism 47 includes a well-known escape wheel & pinion 48 and an ankle 49. The escape wheel & pinion 48 is rotatably attached to a shaft 50 which is planted on the front surface of the dark box 28.
The gear 4 is provided on the outer periphery of the escape wheel 48 over the entire periphery.
8a are formed. When the shutter disk 41 rotates in the opening direction and the slit 41a rotates to a position where the shutter opening 44 is fully opened, the gear 41e is moved to the gear 4 position.
8a so that braking is applied to the subsequent rotation of the shutter disk 41 in the opening direction.

An opening 5 is provided at the center of the front surface of the shutter cover 40.
1 is formed, and the lens barrel 5 is
2 are formed. An aperture plate 52 having a circular aperture opening 53a as an aperture is provided in the lens barrel 52.
And the photographing lens 5 are fitted in order, and these are held by mounting the lens holder 53 to the lens barrel 51.

Next, the operation of the above configuration will be described.
The photo film 27 is loaded into the main body base 20 together with the cartridge 26. Then, the exposure unit 21, the strobe device 22, the front cover 23, and the rear cover 24 are assembled to the main body 20 to complete the unit main body 3. After the inspection, the exterior label 4 is attached to the unit main body 3, and the film unit with the lens is attached. 2 is completed. A monopod 1 for fixing is provided below the completed film unit 2 with lens.
4 is assembled, shipped, and provided for photographing under the user.

When taking a picture, first, the film winding operation knob 13 is rotated to wind up the photographic film 27 by one frame. Then, a shutter charge is performed in conjunction with the winding. By this shutter charge, the kicking spring urging the kicking lever 45 in the kicking direction is charged, and the kicking lever 45 moves to the charging position and is locked. Further, the photographer operates the strobe charging start button 9 as necessary to select whether or not to emit strobe light.

For example, since a strobe light illumination effect is provided for a subject at a shooting distance of about 3 m, a strobe is used when shooting a subject such as a person against a night view. To perform flash emission, the flash charging start button 9 is slid upward to the ON position.
Then, the strobe switch 30 is turned on to start charging, and the strobe light emission is allowed. After confirming the completion of charging by flashing the strobe charging table display window 12, the shutter button 10 is pressed.

When the photographer pushes down the shutter button 10, the kicking lever 45 is released from being locked at the charged position in response to the shutter release operation, and the kicking lever 45 is biased by the bias of the kicking spring to move the kicking lever 45 to the right in the figure. Move in the direction. The protrusion 41b of the shutter disk 41 shown in FIG. 4 is kicked by the kick lever 45, and the shutter disk 41 is rotated clockwise against the bias of the return spring 43.

Then, as shown in FIG.
When one end 41f of a completely passes through the shutter opening 44 (see FIG. 3) and the shutter opening 44 is fully opened, the gear 41e of the shutter disk 41 meshes with the gear 48a of the escape wheel & pinion 48. As a result, the shutter disk 41 is braked by the governor mechanism 47, and the rotation of the shutter disk 41 is decelerated. Also, if the charging of the strobe is completed in the fully opened state, the trigger switch 31 of the strobe device 22 is turned on by the pressing piece 41d, and the strobe light is emitted.

Thereafter, the shutter disk 41 is moved to the governor mechanism 4.
7, while continuing to rotate clockwise while being subjected to the braking and governing actions by. Then, as shown in FIG.
Immediately before the other end 41g of 1a reaches the shutter opening 44, the projection 41c formed integrally with the shutter disk 41 comes into contact with the stopper 46. As a result, the clockwise movement of the shutter disk 41 stops. Thereafter, the shutter disk 41 starts to rotate counterclockwise by the urging of the return spring 43, but the shutter disk 41 slowly rotates while being braked by the governor mechanism 47.

When the one end 41f of the slit 41a returns to the position shown in FIG. 5 immediately before reaching the shutter opening 44 (see FIG. 3), the engagement between the gear 41e and the gear 48a is released again, and the shutter disk is released. 41 is released from braking by the governor mechanism 47, and rotates at a high speed from the position in FIG. 5 to the position in FIG. Then, the shutter disc 41 returns to the original closed position, and one exposure operation is completed.

As described above, the shutter opening 44 is opened for a long time by the reciprocation of the shutter disk 41, and during the opening of the shutter opening 44, the light transmitted through the photographing lens 5 passes through the aperture opening 50a and the shutter. The light enters the dark box 28 through the opening 44 to expose the photographic film 27. The exposure time can be changed by changing the width of the slit 41a and the position of the gear 41d.

When the exposure time in the above embodiment is set to 1/30 second, if the exposure time of the current film unit with a lens is set to 1/125 second, the EV value is increased by about two steps. This has the same effect as increasing the ISO sensitivity 400 film to 1600. If this is increased to 1/15 second, the ISO sensitivity becomes equivalent to 3200, and night scene shooting can be performed under more appropriate exposure conditions.

As described above, by increasing the time during which the slit 41a of the shutter disk 41 opens the shutter opening 44 by the governor mechanism 47, it becomes possible to take a night view with a sufficient exposure. In addition, since the shutter disk 41 is released from the governor mechanism 47 and rotates at a high speed until the slit 41a completely opens the shutter opening 44 and after the shutter opening 44 starts to be closed again, the exposure unevenness of the photographing screen is reduced. Can be reliably prevented.

In the above embodiment, the monopod 14 is used as a device for fixing the unit body in order to prevent camera shake during photographing. However, as shown in FIG. 15 may be used. Since the suction cups 15 can be inclined with respect to the unit main body 3, the posture of the unit main body 3 can be appropriately changed even when not only a horizontal plane but also a vertical plane or an inclined plane is used. Note that a magnet may be used instead of the suction cup 15.

As described above, by using the device for fixing the unit main body, it becomes possible to take a picture in which camera shake is inconspicuous even with a slow shutter as in the present invention.
It should be noted that by being able to handle a slow shutter, a certain amount of astrophotography can be taken.

FIG. 8 is an explanatory diagram showing a second embodiment of the present invention. A shutter disk 61 that opens and closes a shutter opening on the optical axis of the photographing lens 60 of the film unit with a lens is rotatably mounted on the unit main body,
When the shutter disk 61 makes one rotation in the clockwise direction in the figure, one shot is taken. When the kick lever 65 that kicks rightward in the drawing by the shutter release kicks the projection 61b, the shutter disk 6
1 rotates clockwise.

The shutter disk 61 has a large-diameter slit 61a. Then, as shown in FIG. 9, when one end 61f of the slit 61a passes through the shutter opening due to the rotation of the shutter disk 61, the shutter opening is fully opened, and exposure to the photographic film is started. At the same time, the projection 61d is
Is opened and closed, and strobe light emission is performed.

Thereafter, the exposure of the photographic film is performed until the shutter disk 61 continues to rotate clockwise and the other end 61g of the slit 61a passes through the shutter opening and closes the shutter opening. This large-diameter slit 61
Reference symbol a denotes an opening having a size equal to or more than a half circumference of the shutter disk 61, and the shutter opening is opened for 1/30 second or more while the shutter disk 61 makes one rotation. This makes it possible to perform night view shooting under more appropriate exposure conditions. In addition, since the exposure is performed once by the slit 61a passing through the shutter opening in one direction, the exposure time is the same at both ends of the shutter opening, and exposure unevenness does not occur.

Thereafter, the protrusion 61c is moved to the reverse rotation preventing lever 70.
Is curved and overcome, and one shot is completed. In addition,
The shutter disc 61 is prevented from rotating in the reverse direction by the reverse rotation prevention lever 70 and the projection 61c until the shutter charge is performed again and the kicking lever 65 is engaged with the projection 61b.

[0037]

As described above, in the present invention, the shutter speed is reduced by applying a brake to the rotation of the shutter plate, so that a dark scene or a night scene can be photographed. In addition, even at the time of photographing a person with a night view in the background, the use of a strobe makes it possible to photograph both the night view and the person with proper exposure. Further, before the shutter opening is completely opened and after the shutter opening is started to be closed again, the shutter plate rotates at a high speed without being subjected to braking, so that exposure unevenness of the photographing screen can be reduced. Furthermore, by attaching a support jig such as a monopod to the lens-fitted film unit, it is possible to perform a photographing in which camera shake is inconspicuous even when the shutter speed becomes slow.

[Brief description of the drawings]

FIG. 1 is an external view of a film unit with a lens according to the present invention.

FIG. 2 is an exploded view of the unit main body shown in FIG.

FIG. 3 is an exploded view of the exposure unit shown in FIG.

FIG. 4 is an explanatory diagram showing a state immediately before the shutter disk starts rotating clockwise.

FIG. 5 is an explanatory diagram showing a state when a shutter opening is fully opened.

FIG. 6 is an explanatory diagram showing a state when a protrusion comes into contact with a stopper.

FIG. 7 is an external view of a lens-fitted film unit when a suction cup is used as a fixing device.

FIG. 8 is an explanatory view showing a shutter disk according to a second embodiment.

FIG. 9 is an explanatory diagram showing a state when the shutter opening of FIG. 8 is fully opened.

[Explanation of symbols]

 14 Monopod 41 Shutter disk 41a Slit 41e, 48a Gear 44 Shutter opening 45 Kicking lever 47 Governor mechanism

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03C 3/00 575 G03C 3/00 575C 575H F term (Reference) 2H081 AA59 AA78 BB05 BB28 CC53 CC58 2H082 BB03 BB35 2H100 AA16 AA17 BB06 BB08 EE01 2H101 AA01 AA09 BB01 2H105 AA02 AA25 AA28 AA31

Claims (4)

[Claims] A slit for fully opening a shutter opening is formed, a shutter plate urged by a spring in a closing direction is kicked off in an opening direction in response to a shutter release, and returned to a closed position by a spring urge to perform one photographing. In the film unit with a lens provided with a shutter mechanism, the shutter plate moves in the opening direction and the shutter opening is fully opened by the slit. A film unit with a lens provided with an exposure adjusting mechanism for applying a brake to the movement of the shutter plate and extending the exposure time until the edge enters the shutter opening and the shutter opening starts to close. 2. The exposure time of the shutter mechanism is 1/1/2.
2. The film unit with a lens according to claim 1, wherein the time is at least 30 seconds. 3. A lens-equipped film unit provided with a shutter mechanism for performing one rotation by rotating a disk-shaped shutter plate provided with a slit for fully opening a shutter opening. Exposure time is 1
/ 30 seconds or more, and the shutter plate rotates by kicking in response to a shutter release. 4. The lens-fitted film unit according to claim 1, wherein a support jig for the unit main body is provided in the unit main body in which the shutter mechanism is incorporated.